sanshou would be best for you i think as when sparring in sanshou most things are allowed as in checking kicks catching leg kicks etc, even the thai clinch is lightly practised in sparring and taught, tho that is just my sanshou gym, your tkd training will probably come in handy when learning sanshou in that it wont all be new so yeah try it out, make sure you find a good sanshou gym :D